What is the difference between brushless and brushed blower?(1)
I. Difference in working principle
- Brushed blower
Brushed blowers use mechanical commutation, the magnetic poles do not move and the coil rotates. When the motor operates, the coil and commutator rotate, the magnets and carbon brushes do not rotate, and the alternating change of coil current direction is accomplished by the phase changer and brushes that rotate with the motor. Carbon electrodes slide on the coil terminals to achieve the change of direction, called carbon brushes.
Sliding against each other will rub the carbon brushes and cause wear and tear, requiring regular replacement of the brushes; alternating between the carbon brushes and the coil lugs on and off will result in electrical sparks, generating electromagnetic waves that interfere with electronic equipment.
- Brushless blower
Brushless blowers take electronic commutation, the coil does not move, the magnetic poles rotate. The work of phase switching is left to the control circuit in the controller (generally Hall sensor + controller, more advanced technology is magnetic encoder) to complete; Hall elements sense the position of the magnetic poles of the permanent magnets, so that the electronic circuit to switch the direction of the current in the coil in real time to drive the motor.
II. Difference in speed regulation
- Brush blower--Variable voltage speed regulation
It is to adjust the supply voltage high and low, change the magnetic field strength, to achieve the purpose of changing the speed; Variable voltage speed regulation.
- Brushless blower--Frequency speed regulation
It is to adjust the power supply voltage unchanged, change the control signal of ESC to achieve the purpose of changing the rotational speed;
Post time: Apr-23-2024